Removal of tetracycline from aqueous solution by ultrasound and ultraviolet enhanced persulfate oxidation

Tetracycline (TC) is the second most-consumed antibiotic and is produced worldwide. Environmental contamination with TC is considered as a serious concern in public health. Thus, many attempts have been made to discover new removal processes of TC. This study was conducted to evaluate the efficiency removal of TC from aqueous solution during combined ultrasonic (US), ultraviolet (UV) radiation, and persulfate (PS) process. The effect of various parameters including contact time (0�120 min), TC concentration (10�70 mg/L), pH (3�10), PS concentration (2�6 mM), and the input US power (100�500 W) were investigated in this process. At the end of each process, the remaining TC was measured by spectrophotometer (261 nm). The results implied that each of the UV and US processes alone did not have considerable removal efficiency of TC, as these values for UV and US processes were 41.69 and 12.36, respectively. Additionally, the high-est removal efficiency rate of TC was approximately 96.29 which was observed in combined UV/US/PS process during optimum conditions, including pH = 10, TC concentration = 10 mg/L, PS concentration = 4 mM, and input US power = 500 W. Our study supports the notion that UV/US/PS process can be applied to remove antibiotics such as TC or others with the same structure as well to optimize their biodegradation. © 2020 Desalination Publications. All rights reserved

Oxidative removal of tetracycline by sono fenton-like oxidation process in Aqueous media

In the present study, the removal of tetracycline antibiotic was investigated using the Sono Fenton like oxidation and using magnetic nanoparticles Fe3 O4 (MNPs) was prepared. By using X-ray diffrac-tion, scanning electron microscopy, and energy-dispersive X-ray spectroscopy techniques, we tried to characterize the catalyst. Experimental parameters such as Fe3 O4 MNP dose, initial solution pH, and H2 O2 concentration, initial antibiotic concentration, and ultrasonic power were evaluated by one factor at a time method. The maximum removal of tetracycline was under the optimal conditions, including pH = 3, concentration of hydrogen peroxide = 5 mM, catalyst dosage = 500 mg/L, ultrasonic power = 500 watt and reaction time = 120 min. The results showed that TC and TOC removal efficiencies of 88.36 and 32.3. Furthermore, Fe3 O4 nanoparticles retained its activity and degradation efficiency remained even after four concessive cycles of use. According to the findings of this study, the advanced ultrasound/Fe3 O4 /H2 O2 oxidation process has high potency in removing tetracycline antibiotics from aqueous solutions and real hospital wastewater. © 2020 Desalination Publications. All rights reserved

Biogenic nanosilver � assisted degradation of tetracycline in aqueous solutions via sulfate and hydroxyl radicals

Tetracycline (TC), a widely used antibiotic in medicine and veterinary system around the world, is a major pollutant. Advanced oxidation processes based on radical sulfate and hydroxyl are widely applied due to the high oxidation potential for the degradation of recalcitrant organic pollutants in aqueous media. Herein, a strategy based on the green-synthesized biogenic nanosil-ver is described in conjunction with the deployment of peroxymonosulfate (PMS) and hydrogen peroxide which were activated by silver for the remediation of tetracycline in water. The effects of various parameters such as biogenic nanosilver dosage, the varying concentration of PMS and hydrogen peroxide, pH, and initial concentration of antibiotic in TC degradation were investi-gated; TC removal efficiency was over 85 within 90 min under optimal conditions: 15 mg/L TC, 50 mM PMS, 4 mM Ag nanoparticle, pH = 4, and 80 mM H2 O2. The degradation of tetracycline in the PMS/H2 O2 /Ag NPs process followed the pseudo-first-kinetics. © 2020 Desalination Publications. All rights reserved

Biogenic Silver Nanoparticles/Hydrogen Peroxide/Ozone: Efficient Degradation of Reactive Blue 19

Textile dyes are one of the most significant organic pollutants that are responsible for numerous environmental problems. This study was performed to determine the process efficiency of the greener silver nanoparticles/hydrogen peroxide/ozone combination to degrade, common dye, and reactive blue 19. The removal efficiency for reactive blue 19 and chemical oxygen demand (COD) was investigated under varying conditions such as pH, initial catalyst concentration, initial oxidant concentration, and initial dye concentration with ozone flow rate of 1 gr/min; optimum conditions found being 5 mg L�1 reactive blue 19 dye, pH = 3, 0.025 mg L�1 of calcium peroxide, 5 mg L�1 of AgNPs and contact time of 30 min when maximum removal efficiency of 98 was attained. The catalytic activity of AgNPs was maintained for two cycles but after the third and fourth use, the removal efficiency is reduced due to the changes in the catalyst surface as well as the inactivation of the catalyst by the intermediate products produced during the process. In addition to salient features such as strong oxidation, decomposition of refractory organic compounds, and high efficiency, this method may be advisable for removal of reactive blue 19 dyes from textile industry wastewater. © 2019, Springer Science+Business Media, LLC, part of Springer Nature

The removal of tetracycline with biogenic CeO2 nanoparticles in combination with US/PMS process from aqueous solutions: Kinetics and mechanism

Antibiotics have received great attention because of their abuse and potential hazards to the human health and environment. In the current work, peroxymonosulfate (PMS) was added to a cerium oxide (CeO2)/ultrasonic (US) system for tetracycline (TC) degradation. CeO2 nanoparticles (NPs) were synthesized by a simple and cost-effective method using Stevia rebaudiana leaf extract and cerium nitrate as precursors. The as-synthesized CeO2 NPs were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier-transform infrared spectroscopy analysis. The effects of catalyst dosage, PMS concentration, US power, initial antibiotic concentration, and pH on TC removal were investigated. The results confirmed the formation of CeO2 NPs with a fluorite structure, spherical shape, and average particle size of 29 nm. The removal efficiency of TC was 92.6 in the optimum oxidation conditions (TC ¼ 15 mg/L, PMS ¼ 50 mM, CeO2 ¼ 0.6 g/L, pH ¼ 6, and US ¼ 70 W) and followed the zero-order kinetics. Experiment scavenger demonstrated both sulfate and hydroxyl radicals (SO4�-�OH) were responsible for degrading antibiotics. Biogenic CeO2 NPs and ultrasound waves-activated PMS is a promising technology for water pollution caused by contaminants such as pharmaceuticals. © 2021 The Authors Water Science & Technology

CoFe2O4@Methylcelloluse as a New Magnetic Nano Biocomposite for Sonocatalytic Degradation of Reactive Blue 19

Reactive Blue 19 (RB19) removal from synthetic textile wastewater was investigated by using a CoFe2O4@methylcellulose (MC) activated with peroxymonosulfate (PMS) and the ultrasound process. CoFe2O4@MC as a new magnetic nano-biocomposite was prepared using a convenient and rapid microwave-assisted technique in presence of MC as a green biopolymer, and characterized by FESEM, EDS, Mapping, TEM, FTIR, XRD, TGA, VSM, and BET techniques. Then, the effective parameters including pH (4�10), reaction time (0�30 min), CoFe2O4@MC (0.2�1 g/L), and PMS concentration (0.5�10 mM) in the sonocatalytic degradation of RB19 were investigated. The maximum removal efficiency of RB19 was achieved as 97 for synthetic wastewater under the optimal conditions of pH 4, CoFe2O4@MC dosage (0.6 g/L), reaction time = 30 min, and PMS (5 mM) in the presence of ultrasonic waves (60 kHz) at the ambient room temperature of 22 °C. The CoFe2O4@MC catalyst was simply isolated using a magnet and recycled with no remarkable loss of catalytic activity following usage in four runs. The results showed that the CoFe2O4@MC sonocatalysis process is practical, and effective for degrading complex and resistant dyes such as RB19. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature

Degradation of Ciprofloxacin Using Ultrasound/ZnO/Oxone Process from Aqueous Solution-Lab-Scale Analysis and Optimization

Nowadays, the existence of antibiotic compounds in pharmaceutical wastewaters is one of the new problems that can be considered in environmental pollution. The removal of ciprofloxacin from aqueous solutions is examined in the present study by using peroxymonosulfate (Oxone=PMS) activated with hybridized ultrasonic waves and synthesized ZnO nanoparticles. Operational parameters like ZnO nanoparticles dosage, initial pH, and peroxymonosulfate concentration, and their effect on the removal of the antibiotic have been investigated. The results showed 98.3 antibiotics removal observed with an initial pH of 3, ZnO nanoparticles dosage of 1 g/L, and peroxymonosulfate concentration of 1 g/L. This process had a high removal efficiency and was suitable for the removal of ciprofloxacin from aquatic environments. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature

Ancestry-shift refinement mapping of the C6orf97-ESR1 breast cancer susceptibility locus.

Contains fulltext : 88175.pdf (publisher's version ) (Open Access)We used an approach that we term ancestry-shift refinement mapping to investigate an association, originally discovered in a GWAS of a Chinese population, between rs2046210[T] and breast cancer susceptibility. The locus is on 6q25.1 in proximity to the C6orf97 and estrogen receptor alpha (ESR1) genes. We identified a panel of SNPs that are correlated with rs2046210 in Chinese, but not necessarily so in other ancestral populations, and genotyped them in breast cancer case:control samples of Asian, European, and African origin, a total of 10,176 cases and 13,286 controls. We found that rs2046210[T] does not confer substantial risk of breast cancer in Europeans and Africans (OR = 1.04, P = 0.099, and OR = 0.98, P = 0.77, respectively). Rather, in those ancestries, an association signal arises from a group of less common SNPs typified by rs9397435. The rs9397435[G] allele was found to confer risk of breast cancer in European (OR = 1.15, P = 1.2 x 10(-3)), African (OR = 1.35, P = 0.014), and Asian (OR = 1.23, P = 2.9 x 10(-4)) population samples. Combined over all ancestries, the OR was 1.19 (P = 3.9 x 10(-7)), was without significant heterogeneity between ancestries (P(het) = 0.36) and the SNP fully accounted for the association signal in each ancestry. Haplotypes bearing rs9397435[G] are well tagged by rs2046210[T] only in Asians. The rs9397435[G] allele showed associations with both estrogen receptor positive and estrogen receptor negative breast cancer. Using early-draft data from the 1,000 Genomes project, we found that the risk allele of a novel SNP (rs77275268), which is closely correlated with rs9397435, disrupts a partially methylated CpG sequence within a known CTCF binding site. These studies demonstrate that shifting the analysis among ancestral populations can provide valuable resolution in association mapping